Flask



FIG. 1 is a front, top, and right perspective view of a flask, showingour new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a back elevational view thereof;

FIG. 6 is a right elevational view thereof; and,

FIG. 7 is a left elevational view thereof.

The broken lines in the drawings depict portions of the flask that formno part of the claimed design.

CLAIM We claim the ornamental design for a flask, as shown and described. 